Transmission Problems? Ask a Mechanic for Answers ASAP
do you happen to know the last time the fluid was serviced?
i would start with changing the fluid and filter if it has not been done. if it continues to have the same symptom it could be your torque converter going bad. but if you are not wanting to spend the money adding a quart of lucas stop slip may help out if the issue is still there. this stuff actually works quite well. but is not a permanent fix by any means.